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Operational Amplifiers

Slew Rate

At high signal speeds, there is a limit on the maximum rate of change of the amplifier output voltage. This limiting rate of change is called the slew rate. It is usually expressed as volts per microsecond. Often it is specified for the condition where the amplifier in the voltage-follower configuration is delivering the rated output voltage across the rated load. If inverting and noninverting slewing rates are different, the lower of the two should be specified. For some 741-type amplifiers, the slewing rate is about 0.7 V/µs. The slew rate is an indicator of the maximum frequency at which the rated output can be varied without significant distortion.



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